US3394607A - Transmission mechanism having variable transmission ratios - Google Patents

Transmission mechanism having variable transmission ratios Download PDF

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Publication number
US3394607A
US3394607A US540235A US54023566A US3394607A US 3394607 A US3394607 A US 3394607A US 540235 A US540235 A US 540235A US 54023566 A US54023566 A US 54023566A US 3394607 A US3394607 A US 3394607A
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United States
Prior art keywords
disc
pulley
variable transmission
movable
balls
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Expired - Lifetime
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US540235A
Inventor
Hubert Henry
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/30—Driving arrangements 
    • D06F37/36—Driving arrangements  for rotating the receptacle at more than one speed
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/32—Friction members
    • F16H55/52—Pulleys or friction discs of adjustable construction
    • F16H55/56—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable
    • F16H55/563—Pulleys or friction discs of adjustable construction of which the bearing parts are relatively axially adjustable actuated by centrifugal masses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
    • F16H61/66231—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling shifting exclusively as a function of speed
    • F16H61/66245—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling shifting exclusively as a function of speed using purely mechanical sensing or control means

Definitions

  • ABSTRACT OF THE DISCLOSURE A variable transmission ratio mechanism with a movable disc having a curvilinear race surface for a ball, the radius of curvature of the race being substantially equal to the radius of curvature of the corresponding ball in the race.
  • the invention relates to a transmission mechanism having a variable transmission ratio (for example, for driving a domestic clothes washer having a washing and a spinning Speed), which mechanism comprises a pulley on a driving shaft which consists of a conical disc keyed to said shaft and a conical disc which is movable in the direction of the centre lines of the shaft, the shaft having rigidly secured to it a second disc between which second disc and the movable disc a number of balls are arranged which, an acceleration of the driving shaft, move outwards thereby displacing the movable disc and thus varying the effective diameter of the pulley.
  • a driving shaft which consists of a conical disc keyed to said shaft and a conical disc which is movable in the direction of the centre lines of the shaft, the shaft having rigidly secured to it a second disc between which second disc and the movable disc a number of balls are arranged which, an acceleration of the driving shaft, move outwards thereby displacing the movable disc and thus varying
  • a problem in the construction of mechanisms of the said type is that it has to be prevented that the displacement of the balls produces grooves in the surfaces of the discs, which would result in the pulley being worn out rapidly.
  • One of the proposed solutions consists in guiding the balls in such manner that their ball track is different for every displacement.
  • this solution necessitates the provision of an additional member which increases the cost price of the assembly.
  • the present invention mitigates the above-mentioned drawbacks without this requiring a costly mechanical solution.
  • the invention is characterized in that one of the sides facing one another of the second disc and the movable disc is provided with cylindrical grooves in each of which one of the balls can run, the radius of curvature of which measured in a plane at right angles to the surface of the disc throughout the length of the grooves being equal to or substantially equal to that of the ball running in the groove in question.
  • the mechanism according to the invention is even further improved if also the second of the two said sides facing one another is provided with grooves of the said shape.
  • a preferred embodiment is characterized in that the grooves are limited at least at one of their ends by spherical parts the radius of which is equal to or substantially equal to that of the ball running in the groove in question.
  • the discs 1 and 2 are rigidly secured to the driving shaft 3 which may be the shaft of a driving motor.
  • the shaft 3 has likewise rigidly secured to it a sleeve 4 on which the disc 5' with its bearing 6 can move freely in the axial direction under the influence of balls 7 which move in cylindrical grooves 8 and 9 provided in the discs 2 and 5 respectively.
  • the said pulley is coupled by the belt 10 to a known second movable pulley not shown of the type comprising a fixed truncated disc and a movable truncated disc capable of moving along the axis under the influence of a spring.
  • the belt 10 When the driving shaft 3 rotates at a reduced speed, the belt 10 is at the bottom of the score formed by the truncated faces of the discs 1 and 5.
  • the speed increases the balls 7 move away from the driving shaft 3 under the action of the centrifugal force and produce a resultant force on the movable disc 5 which exceeds the pressure of the spring of the second movable pulley; the disc 5 approaches the disc 1 which produces an increase of the effective diameter of the said pulley and a decrease of the effective diameter of the second pulley.
  • a transmission mechanism with a variable transmission ratio comprising a drive shaft, a pulley on said drive shaft including a first disc fixed to said drive shaft and a second disc having a curvilinear groove therein at the rear surface thereof movable axially on said drive shaft, a third disc fixed to said drive shaft and having a curvilinear groove located in space-confronting manner with the curvilinear groove in the second disc, a plurality of balls in said curvilinear grooves adapted to move outwardly to thereby displace said second disc and thus vary the effective diameter of said pulley when the rotation of said drive shaft is accelerated, the radius of curvature of at least one of said curvilinear grooves being measured in a plane at right angles to the surface of said disc throughout the length of said groove being substantially equal to the radius of curvature of the corresponding ball in said one groove.
  • each of said curvilinear grooves located in space confronting manner to each other are provided with a radius of curvature measured in a plane at right angles to the surface of said disc throughout the length of said groove which is substantially equal to the radius of curvature of the corresponding ball therein.

Description

H. HUBERT July 30, 1968 TRANSMISSION MECHANISM HAVING VARIABLE TRANSMISSION RATIOS Filed April 5. 1966 INVENTOR. HENRY HUBERT AGENT United States Patent 3 Claims. 5i. 74 2a0.17
ABSTRACT OF THE DISCLOSURE A variable transmission ratio mechanism with a movable disc having a curvilinear race surface for a ball, the radius of curvature of the race being substantially equal to the radius of curvature of the corresponding ball in the race.
The invention relates to a transmission mechanism having a variable transmission ratio (for example, for driving a domestic clothes washer having a washing and a spinning Speed), which mechanism comprises a pulley on a driving shaft which consists of a conical disc keyed to said shaft and a conical disc which is movable in the direction of the centre lines of the shaft, the shaft having rigidly secured to it a second disc between which second disc and the movable disc a number of balls are arranged which, an acceleration of the driving shaft, move outwards thereby displacing the movable disc and thus varying the effective diameter of the pulley.
A problem in the construction of mechanisms of the said type is that it has to be prevented that the displacement of the balls produces grooves in the surfaces of the discs, which would result in the pulley being worn out rapidly. One of the proposed solutions consists in guiding the balls in such manner that their ball track is different for every displacement. However, this solution necessitates the provision of an additional member which increases the cost price of the assembly.
The present invention mitigates the above-mentioned drawbacks without this requiring a costly mechanical solution. The invention is characterized in that one of the sides facing one another of the second disc and the movable disc is provided with cylindrical grooves in each of which one of the balls can run, the radius of curvature of which measured in a plane at right angles to the surface of the disc throughout the length of the grooves being equal to or substantially equal to that of the ball running in the groove in question.
The mechanism according to the invention is even further improved if also the second of the two said sides facing one another is provided with grooves of the said shape.
A preferred embodiment is characterized in that the grooves are limited at least at one of their ends by spherical parts the radius of which is equal to or substantially equal to that of the ball running in the groove in question.
In order that the invention may readily be carried into effect, it will now be described in greater detail, by way of example, with reference to the accompanying drawing which shows the movable pulley of a mechanism according to the invention in the position in which the effective diameter is at a maximum.
The discs 1 and 2 are rigidly secured to the driving shaft 3 which may be the shaft of a driving motor. The shaft 3 has likewise rigidly secured to it a sleeve 4 on which the disc 5' with its bearing 6 can move freely in the axial direction under the influence of balls 7 which move in cylindrical grooves 8 and 9 provided in the discs 2 and 5 respectively. The said pulley is coupled by the belt 10 to a known second movable pulley not shown of the type comprising a fixed truncated disc and a movable truncated disc capable of moving along the axis under the influence of a spring.
When the driving shaft 3 rotates at a reduced speed, the belt 10 is at the bottom of the score formed by the truncated faces of the discs 1 and 5. When the speed increases the balls 7 move away from the driving shaft 3 under the action of the centrifugal force and produce a resultant force on the movable disc 5 which exceeds the pressure of the spring of the second movable pulley; the disc 5 approaches the disc 1 which produces an increase of the effective diameter of the said pulley and a decrease of the effective diameter of the second pulley.
When the speed of the shaft 3 decreases the resultant force exercised by the balls on the discs 5 is maller than the pressure of the spring of the second pulley so that the two discs of the latter pulley approach one another; so a separation of the discs 1 and 5 and the return of the balls to their initial position is obtained.
What is claimed is:
1. A transmission mechanism with a variable transmission ratio comprising a drive shaft, a pulley on said drive shaft including a first disc fixed to said drive shaft and a second disc having a curvilinear groove therein at the rear surface thereof movable axially on said drive shaft, a third disc fixed to said drive shaft and having a curvilinear groove located in space-confronting manner with the curvilinear groove in the second disc, a plurality of balls in said curvilinear grooves adapted to move outwardly to thereby displace said second disc and thus vary the effective diameter of said pulley when the rotation of said drive shaft is accelerated, the radius of curvature of at least one of said curvilinear grooves being measured in a plane at right angles to the surface of said disc throughout the length of said groove being substantially equal to the radius of curvature of the corresponding ball in said one groove.
2. A transmission mechanism with a variable transmission ratio as claimed in claim 1 wherein each of said curvilinear grooves located in space confronting manner to each other are provided with a radius of curvature measured in a plane at right angles to the surface of said disc throughout the length of said groove which is substantially equal to the radius of curvature of the corresponding ball therein.
3. A transmission mechanism with a variable transmission ratio as claimed in claim 1 wherein at least one end of one of said grooves is provided with a spherical structure having a radius that is substantially equal to that of the corresponding ball in said groove.
References Cited FOREIGN PATENTS 485,804 8/1952 Canada. 1,045,919 7/1953 France. 1,121,165 4/1956 France. 1,187,177 3/ 1959 France.
C. J. HUSAR, Primary Examiner.
US540235A 1965-04-07 1966-04-05 Transmission mechanism having variable transmission ratios Expired - Lifetime US3394607A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR12294A FR1440711A (en) 1965-04-07 1965-04-07 Speed variator

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US3394607A true US3394607A (en) 1968-07-30

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FR (1) FR1440711A (en)
NL (1) NL6604441A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803491A (en) * 1955-11-07 1957-08-20 Loren A Brown Container for transporting bulk material in cargo trailers
US3599504A (en) * 1970-02-02 1971-08-17 Borg Warner Automatic transmission
US3808900A (en) * 1972-11-09 1974-05-07 Jarry Precision Ltd Drive sheave
US3996807A (en) * 1974-03-05 1976-12-14 Cam Gears Limited Centrifugally controlled toroidal transmission
US4028953A (en) * 1976-01-07 1977-06-14 Gilles Soucy Variable diameter pulley
US20070197322A1 (en) * 2005-12-21 2007-08-23 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Method for improving the towing suitability of a motor vehicle equipped with a belt-driven conical-pulley transmission, and a conical disk pair
US20080047772A1 (en) * 2004-03-18 2008-02-28 Yousuke Ishida Belt Type Continuous Variable Transmission, Power Unit Having He Type Continuous Varible Transmission, Vehicle Mounting Thereon The Belt Type Continuous Variable Transmission, And Sheave For Continuous Variable Transmission
US20150111674A1 (en) * 2013-10-17 2015-04-23 The Gates Corporation Cvt drive clutch
ITUB20159631A1 (en) * 2015-12-24 2017-06-24 Alessandro Fanotto PULLEY GROUP OF A SPEED CHANGE? WITH CONTINUOUS CHANGE

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA485804A (en) * 1952-08-19 Murch Davey Almer Centrifugal pulley clutch
FR1045919A (en) * 1951-11-14 1953-12-02 Automatic variable speed drive
FR1121165A (en) * 1955-02-04 1956-07-24 Ind Du Ct L V-belt automatic speed variator, for mopeds, mopeds, motorcycles and similar vehicles
FR1187177A (en) * 1957-11-15 1959-09-08 Motobecane Ateliers Further development of automatic variable speed drives with extendable pulley

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA485804A (en) * 1952-08-19 Murch Davey Almer Centrifugal pulley clutch
FR1045919A (en) * 1951-11-14 1953-12-02 Automatic variable speed drive
FR1121165A (en) * 1955-02-04 1956-07-24 Ind Du Ct L V-belt automatic speed variator, for mopeds, mopeds, motorcycles and similar vehicles
FR1187177A (en) * 1957-11-15 1959-09-08 Motobecane Ateliers Further development of automatic variable speed drives with extendable pulley

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2803491A (en) * 1955-11-07 1957-08-20 Loren A Brown Container for transporting bulk material in cargo trailers
US3599504A (en) * 1970-02-02 1971-08-17 Borg Warner Automatic transmission
US3808900A (en) * 1972-11-09 1974-05-07 Jarry Precision Ltd Drive sheave
US3996807A (en) * 1974-03-05 1976-12-14 Cam Gears Limited Centrifugally controlled toroidal transmission
US4028953A (en) * 1976-01-07 1977-06-14 Gilles Soucy Variable diameter pulley
US20080047772A1 (en) * 2004-03-18 2008-02-28 Yousuke Ishida Belt Type Continuous Variable Transmission, Power Unit Having He Type Continuous Varible Transmission, Vehicle Mounting Thereon The Belt Type Continuous Variable Transmission, And Sheave For Continuous Variable Transmission
US7803074B2 (en) * 2004-03-18 2010-09-28 Yamaha Hatsudoki Kabushiki Kaisha Belt type continuous variable transmission, power unit having the belt type continuous variable transmission, vehicle mounting thereon the belt type continuous variable transmission, and sheave for continuous variable transmission
US20070197322A1 (en) * 2005-12-21 2007-08-23 Luk Lamellen Und Kupplungsbau Beteiligungs Kg Method for improving the towing suitability of a motor vehicle equipped with a belt-driven conical-pulley transmission, and a conical disk pair
US20150111674A1 (en) * 2013-10-17 2015-04-23 The Gates Corporation Cvt drive clutch
ITUB20159631A1 (en) * 2015-12-24 2017-06-24 Alessandro Fanotto PULLEY GROUP OF A SPEED CHANGE? WITH CONTINUOUS CHANGE
EP3184858A1 (en) * 2015-12-24 2017-06-28 Alessandro Fanotto Pulley assembly for a continuously variable transmission

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FR1440711A (en) 1966-06-03
NL6604441A (en) 1966-10-10

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